AMD released the first WHQL-signed Catalyst drivers since June. Catalyst 12.8 WHQL is the first unified Catalyst driver certified for Windows 8, its release follows the RTM version of the operating system being available to enterprise and industry customers, ahead of the October 26 consumer retail launch. The driver introduces target-independent rasterization (TIR), an efficient new Direct3D rendering path. The driver also works to improve GPU power consumption. A suite of Windows 8-exclusive features, including native stereo 3D support and unified video API are included. Catalyst 12.8 WHQL also introduces performance-improvements specific to games, including up to 25% performance increase in Elder Scrolls: Skyrim, 10% in Dirt 3, 6% in Batman: Arkham City, and 3% in Battlefield 3. Several game-specific bugs were patched.